Shane and Elena are choosing how to light a room. They can get the room to the same brightness by using the lights shown in the table.
| Type of light | Number needed to get the same brightness | Total energy used every second (joules) | How long does it last? |
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120 candles | 4800 J | 2 hours |
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1 low energy bulb | 18 J | 2 years |
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1 filament bulb | 100 J | 9 months |
Images source: Wikipedia
| a) | i) |
Which type of lighting would be good if there was an electrical power cut?
____________________
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| ii) |
Explain your choice.
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| b) | i) |
Which type of lighting is best for saving energy? ____________________
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| ii) |
Explain your choice.
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| c) | i) |
The candles and bulbs all produce light and heat. The table shows lighting that produces the same amount of light.
Which type of lighting produces least heat energy? ____________________ |
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| ii) |
Explain your choice.
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| d) |
Fill in the table below, describing one advantage (good thing) and one disadvantage (bad thing) of each type of light.
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